Optical cup



FIG. 1 is a top plan view of the optical cup;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a rear elevational view thereof; and,

FIG. 7 is a top perspective view thereof.

The features shown in phantom do not form a part of the claimed design.

The broken lines that define the bounds of the claimed design form no part thereof. 

CLAIM The ornamental design for an optical cup, as shown and described. 